Association for Behavior Analysis International

In this symposium, presenters will describe basic and applied research in the field of operant variability. This symposium will be chaired by Armando Machado, who will provide brief commentary between presentations. First, Galizio and Odum will share a basic research study on the generalization of reinforced variability across response topographies, levers and nosepokes, in rats. Next, Roberts, Biondolillo, and Yarbrough will show data from a basic research study examining operant variability of timing responses in rats. Next, Falcomata, Bagwell, Ringdahl, McComas, and Shpall will present a translational research study using a human operant resurgence paradigm to determine the effects of using a lag schedule as an alternative response. Lastly, Wolfe, Pound, McCammon, Chezan, and Drasgow will present a systematic review of interventions that promote variability in communication for individuals with autism. They will analyze the existing research on variability interventions for individuals with autism and make recommendations for future research and clinical applications. Finally, Allen Neuringer will serve as the discussant and will discuss theoretical implications of this research.

Basic and applied researchers; practitioners

Myriad previous studies have demonstrated the efficacy of functional communication training (FCT) for the treatment of problem behavior exhibited by individuals with disabilities. However, resurgence may occur if the treatment is challenged by lapses in fidelity. One strategy for “inoculating” against resurgence of problem behavior involves the teaching of multiple modalities of communication during FCT. In the current human operant-based study serving as an analogue to FCT, we alternated two conditions across a 3-phase resurgence preparation. During Phase A, in both conditions, a target response was reinforced on a variable ratio (VR) 10-s schedule. During Phase B, target responding was on extinction in both conditions; an alternative response was reinforced on sequential (i.e., serial) fixed ratio (FR) 1 schedules in one condition and multiple responses were reinforced on a Lag 3 schedule in the other condition. During Phase C, all responses across both conditions were on extinction and persistence of alternative responding and resurgence of targeting responding was compared across conditions. Results varied with regard to resurgence of target responding while the majority of subjects exhibited higher persistence of alternative responding in the Lag schedule condition. Future avenues of research and potential implications of the current results will be discussed.

Abstract: Some individuals with ASD do not acquire vocal language, and those who do may engage in repetitive communicative behaviors that can limit skill acquisition, access to reinforcement, and access to less restrictive settings. Basic and applied research indicate that variability, or the extent to which responses are topographically different from one another, is influenced by antecedent and consequence interventions. Our purpose in this study was to systematically review the literature on interventions to increase variable communication behaviors in individuals with ASD. We identified 31 articles through a database search, and screened them using the What Works Clearinghouse (WWC) Single-Case Design Standards. Twenty studies containing 58 cases met WWC Design Standards. We coded the descriptive characteristics and strength of evidence, based on visual analysis, from each of these 20 studies. Our results indicate that mands and intraverbals were the most frequently targeted verbal operants, and that lag schedules were the most common intervention used to promote variability (65%). Most cases (72%) provide strong evidence of a functional relation between the interventions and varied communicative behavior. We will discuss the implications of our results for practice and for future research on interventions targeting variability with this population.